US11555038B2 - Crystalline forms of (S)-7-(1-(but-2-ynoyl)piperidin-4-yl)-2-(4-phenoxyphenyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine-3-carboxamide, preparation, and uses thereof - Google Patents

Abstract

The present invention relates to a crystalline form of (S)-7-(1-(but-2-ynoyl)piperidin-4-yl)-2-(4-phenoxyphenyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine-3-carboxamide (Compound 1) for inhibiting Btk, methods of preparation thereof and pharmaceutical compositions, and use of the crystalline form above in the treatment of a disease, or in the manufacturing of a medicament for the treatment of a disease, such as an allergic disease, an autoimmune disease, an inflammatory disease, and a cancer.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a U.S. National Stage Application under 35 U.S.C. § 371 of International Application No. PCT/CN2018/074108, filed Jan. 25, 2018, which claims the benefit of International Patent Application No. PCT/CN2017/072553 filed Jan. 25, 2017, the disclosures of which are hereby incorporated by reference in their entireties for all purposes.

FIELD OF THE INVENTION

Disclosed herein are crystalline forms of (S)-7-(1-(but-2-ynoyl)piperidin-4-yl)-2-(4-phenoxyphenyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine-3-carboxamide (hereinafter Compound 1); methods for preparing crystalline forms of Compound 1; pharmaceutical compositions comprising crystalline forms of Compound 1 and a pharmaceutically acceptable carrier; and methods of using crystalline forms of Compound 1 as a Btk inhibitor for treating or preventing diseases.

BACKGROUND OF THE INVENTION

Bruton's tyrosine kinase (Btk) belongs to the Tec tyrosine kinase family (Vetrie et al., Nature 361: 226-233, 1993; Bradshaw, Cell Signal. 22: 1175-84, 2010). Btk is primarily expressed in most hematopoietic cells such as B cells, mast cells and macrophages (Smith et al., J. Immunol. 152: 557-565, 1994) and is localized in bone marrow, spleen and lymph node tissue. Btk plays important roles in B-cell receptor (BCR) and FcR signaling pathways, which involve in B-cell development, differentiation (Khan, Immunol. Res. 23: 147, 2001). Btk is activated by upstream Src-family kinases. Once activated, Btk in turn phosphorylates PLC gamma, leading to effects on B-cell function and survival (Humphries et al., J Biol. Chem. 279: 37651, 2004).

These signaling pathways must be precisely regulated. Mutations in the gene encoding Btk cause an inherited B-cell specific immunodeficiency disease in humans, known as X-linked a gamma-globulinemia (XLA) (Conley et al., Annu. Rev. Immunol. 27: 199-227, 2009). Aberrant BCR-mediated signaling may result in dysregulated B-cell activation leading to a number of autoimmune and inflammatory diseases. Preclinical studies show that Btk deficient mice are resistant to developing collagen-induced arthritis. Moreover, clinical studies of Rituxan, a CD20 antibody to deplete mature B-cells, reveal the key role of B-cells in a number of inflammatory diseases such as rheumatoid arthritis, systemic lupus erythematosus and multiple sclerosis (Gurcan et al., Int. Immunopharmacol. 9: 10-25, 2009). Therefore, Btk inhibitors can be used to treat autoimmune and/or inflammatory diseases.

In addition, aberrant activation of Btk plays an important role in pathogenesis of B-cell lymphomas indicating that inhibition of Btk is useful in the treatment of hematological malignancies (Davis et al., Nature 463: 88-92, 2010). Preliminary clinical trial results showed that the Btk inhibitor PCI-32765 was effective in treatment of several types of B-cell lymphoma (for example, 54th American Society of Hematology (ASH) annual meeting abstract, December 2012: 686 The Bruton's Tyrosine Kinase (Btk) Inhibitor, Ibrutinib (PCI-32765), Has Preferential Activity in the ABC Subtype of Relapsed/Refractory De Novo Diffuse Large B-Cell Lymphoma (DLBCL): Interim Results of a Multicenter, Open-Label, Phase! Study). Because Btk plays a central role as a mediator in multiple signal transduction pathways, inhibitors of Btk are of great interest as anti-inflammatory and/or anti-cancer agents (Mohamed et al., Immunol. Rev. 228: 58-73, 2009; Pan, Drug News perspect 21: 357-362, 2008; Rokosz et al., Expert Opin. Ther. Targets 12: 883-903, 2008; Uckun et al., Anti-cancer Agents Med. Chem. 7: 624-632, 2007; Lou et al, J. Med. Chem. 55(10): 4539-4550, 2012).

International application WO2014173289A disclosed a series of fused heterocyclic compounds as Btk inhibitors. In particular, WO2014173289A disclosed (S)-7-(1-(but-2-ynoyl)piperidin-4-yl)-2-(4-phenoxyphenyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine-3-carboxamide

Compound 1 is a potent, specific and irreversible BTK kinase inhibitor. The data generated in preclinical studies using biochemical, cell based and animal studies have suggested that Compound 1 is of significant benefit in inhibiting tumor growth in B-cell malignancies. Compound 1 was shown to be more selective than ibrutinib for inhibition of BTK vs. EGFR, FGR, FRK, HER2, HER4, ITK, JAK3, LCK, and TEC, indicating that Compound 1 will have less side-effects than ibrutinib in clinic.

However, Compound 1 prepared in accordance with WO2014173289A was found to be in amorphous form, as confirmed by the X-Ray Powder Diffraction (hereinafter XRPD) pattern of FIG. 1A (the existence of a large bump distributed in a wide range) and the TGA/mDSC curves of FIG. 1B (no substantial glass transition signal). The amorphous form of Compound 1 presents some challenges for drug formulation due to its low stability and difficulties to handle. Therefore, there is a need to develop new forms of Compound 1, especially crystalline forms, which are stable and easy to handle and to process in the manufacture and preparation of drug formulations.

SUMMARY OF THE INVENTION

The inventors of the present invention have found solvated or non-solvated crystalline forms of Compound 1, which are stable and easy to handle and to process in the manufacture and preparation of drug formulations compared with the amorphous form of Compound 1. Particularly, the inventors found an anhydrous non-solvated crystalline form (i.e., Form B herein) is suitable for drug formulation due to its high melting point, non-hygroscopicity and good mechanical stability.

In a first aspect, disclosed herein is a crystalline form of Compound 1,

In some embodiments, the crystalline form of Compound 1 is solvated (herein referred to as “Form A” or “Form A as a solvate” or “solvated crystalline form”).

In some embodiments, the crystalline form of Compound 1 is anhydrous non-solvated (herein referred to as “Form B” or “non-solvated crystalline form”).

In a second aspect, disclosed herein is a method of preparing Compound 1.

In a third aspect, disclosed herein is a method of preparing Form A disclosed herein.

In a forth aspect, disclosed herein is a method of preparing Form B disclosed herein.

In a fifth aspect, disclosed herein is a pharmaceutical composition comprising a therapeutically effective amount of Form A or B disclosed herein and a pharmaceutically acceptable carrier.

In a sixth aspect, disclosed herein is a method for treating a disease associated with undesirable Btk activity in a subject by administering to the subject Form A or B disclosed herein. Preferably, the disease is an allergic disease, an autoimmune disease, an inflammatory disease, or a cancer, or a combination of two or more thereof. More preferably, the disease is a B-cell proliferative disease, selected from chronic lymphocytic, non-Hodgkin's lymphoma, diffuse large B cell lymphoma, mantle cell lymphoma, follicular lymphoma, or chronic lymphocytic leukemia, or a combination of two or more thereof. In some embodiment, the inflammatory disease is selected from rheumatoid arthritis, systemic lupus erythematosus and multiple sclerosis.

In a seventh aspect, disclosed herein is a use of Form A or B disclosed herein in manufacturing a medicament for treatment of at least one disease associated with undesirable Btk activity. Preferably, the disease is an allergic disease, an autoimmune disease, an inflammatory disease, or a cancer, or a combination of two or more thereof. More preferably, the disease is a B-cell proliferative disease, selected from chronic lymphocytic, non-Hodgkin's lymphoma, diffuse large B cell lymphoma, mantle cell lymphoma, follicular lymphoma, or chronic lymphocytic leukemia, or a combination of two or more thereof. In some embodiment, the inflammatory disease is selected from rheumatoid arthritis, systemic lupus erythematosus and multiple sclerosis.

BRIEF DESCRIPTIONS OF THE DRAWINGS

FIG. 1A shows the XRPD pattern of the amorphous form of Compound 1.

FIG. 1B shows the TGA/mDSC curves of amorphous form of Compound 1.

FIG. 2A shows the XRPD pattern of Form A (crystallization from EtOAc/n-heptane).

FIG. 2B shows the TGA/DSC curves of Form A (crystallization from EtOAc/n-heptane).

FIG. 2C shows the ¹H-NMR of Form A (crystallization from EtOAc/n-heptane).

FIG. 2D shows XRPD overlay of Form A (crystallization from EtOAc/n-heptane) before and after heating.

FIG. 3A shows the XRPD pattern of Form A (crystallization from EtOH/n-heptane) and Form A (crystallization from acetone/n-heptane).

FIG. 3B shows the XRPD pattern of Form A obtained from slurry conversion of EtOH/n-heptane.

FIG. 3C shows the TGA curve of Form A obtained from slurry conversion of EtOH/n-heptane.

FIG. 3D shows the ¹H-NMR of Form A obtained from slurry conversion of EtOH/n-heptane.

FIG. 3E shows the XRPD overlay of Form A obtained from slurry conversion of EtOH/n-heptane before and after heating.

FIG. 4A shows the XRPD pattern of Crystalline Form B.

FIG. 4B shows the TGA/DSC curves of Form B.

FIG. 4C shows the ¹H-NMR of Crystalline Form B.

FIG. 4D shows the ¹³C-NMR of Crystalline Form B.

FIG. 4E shows DVS plot of Crystalline Form B.

FIG. 4F shows XRPD patterns of Form B pre and post DVS.

FIG. 4G shows XRPD overlay of Form B of Example 4, Example 5A and Example 5B.

FIG. 4H shows XRPD overlay of Form B before and after grinding.

FIG. 5A shows XRPD overlay for slurry at RT starting from amorphous Compound 1.

FIG. 5B shows XRPD overlay for slurry at 50° C. starting from amorphous Compound 1.

FIG. 5C shows XRPD overlay for competitive slurry of Form A and B at 10° C.

FIG. 5D shows XRPD overlay for competitive slurry of Form A and B at RT.

FIG. 5E shows XRPD overlay for competitive slurry of Form A and B at 50° C.

FIG. 6A shows the absolute structure of single crystal of BG-13.

FIG. 6B illustrates hydrogen bonds of single crystal of BG-13.

FIG. 6C shows a crystal packing of single crystal of BG-13.

FIG. 6D shows the XRPD pattern of single crystal of BG-13.

DETAILED DESCRIPTION OF THE INVENTION

The inventors have found that Compound 1 can exist in crystalline forms, either solvated or non-solvated.

In some embodiments, Compound 1 is in solvated crystalline form (i.e., Form A). In a preferred embodiment, Form A is solvated with EtOAc (also referred to as “Form A as an EtOAc solvate”). In other embodiments, Form A is solvated with other solvent or anti-solvent or is to form a hetero-solvate.

In some embodiments, Compound 1 is in Form A characterized by an XRPD comprising diffraction peaks having 2θ angle values independently selected from: approximately 5.3±0.2°, 16.9±0.2°, 18.6±0.2°, 19.8±0.2° and 20.6±0.2°.

In some embodiments, Compound 1 is in Form A characterized by an XRPD comprising diffraction peaks having 2θ angle values independently selected from: approximately 5.3±0.2°, 16.9±0.2°, 18.6±0.2°, 19.8±0.2° and 20.6±0.2°.

In some embodiments, Compound 1 is in Form A characterized by an XRPD comprising diffraction peaks having 2θ angle values independently selected from: approximately 5.3±0.2°, 10.9±0.2°, 16.9±0.2°, 18.6±0.2°, 19.8±0.2°, 20.6±0.2°, 21.1±0.2°, 22.5±0.2° and 22.8±0.20.

In some embodiments, Compound 1 is in Form A characterized by an XRPD comprising diffraction peaks having 2θ angle values independently selected from: approximately 5.3±0.2°, 10.9±0.2°, 11.2±0.2°, 13.4±0.2°, 14.4±0.2°, 16.9±0.2°, 18.6±0.2°, 19.8±0.2°, 20.6±0.2°, 21.1±0.2°, 21.7±0.2°, 22.5±0.2°, 22.8±0.2°, 23.6±0.2° and 24.3±0.2°.

In some embodiments, Compound 1 is in Form A characterized by an XRPD comprising diffraction peaks having 2θ angle values independently selected from: approximately 5.3±0.2°, 10.9±0.2°, 11.2±0.2°, 12.0±0.2°, 13.4±0.2°, 14.1±0.2°, 14.4±0.2°, 16.9±0.2°, 18.1±0.2°, 18.6±0.2°, 19.8±0.2°, 20.6±0.2°, 21.1±0.2°, 21.7±0.2°, 22.5±0.2°, 22.8±0.2°, 23.6±0.2°, 24.0±0.2° and 24.3±0.2°.

In some embodiments, Compound 1 is in Form A characterized by an XRPD comprising diffraction peaks having 2θ angle values independently selected from: approximately 5.3±0.2°, 9.2±0.2°, 10.9±0.2°, 11.2±0.2°, 12.0±0.2°, 13.4±0.2°, 14.1±0.2°, 14.4±0.2°, 15.5±0.2°, 16.9±0.2°, 17.7±0.2°, 18.1±0.2°, 18.6±0.2°, 19.8±0.2°, 20.6±0.2°, 21.1±0.2°, 21.7±0.2°, 22.5±0.2°, 22.8±0.2°, 23.6±0.2°, 24.0±0.2°, 24.3±0.2° and 26.4±0.2°.

In some embodiments, Compound 1 is in Form A characterized by an XRPD substantially in accordance with FIG. 2A.

In some embodiments, Compound 1 is in Form A characterized by an XRPD summarized in Table 1.

TABLE 1
X-ray Diffraction Pattern of Form A of Compound 1

		Diffraction		Relative
	Peak#	angle (2 theta)	Spacing	intensity

	1	5.257	16.80987	75.65
	2	6.847	12.91043	9.90
	3	8.868	9.97248	12.65
	4	9.217	9.59468	16.83
	5	10.947	8.08267	54.46
	6	11.228	7.88084	38.01
	7	11.972	7.39264	19.97
	8	13.383	6.61638	46.72
	9	14.131	6.26740	34.23
	10	14.449	6.13029	39.26
	11	15.532	5.70515	18.97
	12	16.900	5.24643	87.03
	13	17.754	4.99588	23.00
	14	18.126	4.89410	29.17
	15	18.605	4.76923	100.00
	16	19.842	4.47464	88.29
	17	20.560	4.31994	90.99
	18	21.058	4.21899	57.80
	19	21.782	4.08036	41.63
	20	22.453	3.95982	74.39
	21	22.822	3.89668	67.54
	22	23.607	3.76878	37.10
	23	24.061	3.69869	33.71
	24	24.323	3.65943	36.77
	25	25.306	3.51949	35.61
	26	26.400	3.37615	16.09
	27	27.115	3.28872	13.51
	28	28.339	3.14940	7.03
	29	29.252	3.05308	8.39
	30	30.048	2.97402	8.02
	31	30.670	2.91511	6.82
	32	35.033	2.56145	3.45
	33	35.860	2.50421	3.48

In some preferred embodiments, Compound 1 is in Form A as an EtOAc solvate characterized by a DSC substantially in accordance with FIG. 2B.

In some preferred embodiments, Compound 1 is in Form A as an EtOAc solvate characterized by a TGA substantially in accordance with FIG. 2B.

In some embodiments, Compound 1 is in Form B characterized by an XRPD comprising diffraction peaks having 2θ angle values independently selected from: approximately 15.1±0.2°, 20.7±0.2° and 22.8±0.2°.

In some embodiments, Compound 1 is in Form B characterized by an XRPD comprising diffraction peaks having 2θ angle values independently selected from: approximately 15.1±0.2°, 15.5±0.2°, 19.9±0.2°, 20.7±0.2°, 21.7±0.2° and 22.8±0.2°.

In some embodiments, Compound 1 is in Form B characterized by an XRPD comprising diffraction peaks having 2θ angle values independently selected from: approximately 15.1±0.2°, 15.5±0.2°, 17.0±0.2°, 19.9±0.2°, 20.0±0.2°, 20.7±0.2°, 21.7±0.2°, 22.8±0.2° and 24.2±0.20.

In some embodiments, Compound 1 is in Form B characterized by an XRPD comprising diffraction peaks having 2θ angle values independently selected from: approximately 6.3±0 0.2°, 9.5±0.2°, 15.1±0.2°, 15.5±0.2°, 16.5±0.2°, 17.0±0.2°, 19.9±0.2°, 20.0±0.2°, 20.7±0.2°, 21.7±0.2°, 22.8±0.2°, 24.2±0.2° and 25.1±0.2°.

In some embodiments, Compound 1 is in Form B characterized by an XRPD comprising diffraction peaks having 2θ angle values independently selected from: approximately 6.3±0 0.2°, 9.5±0.2°, 12.4±0.2°, 13.2±0.2°, 15.1±0.2°, 15.5±0.2°, 16.5±0.2°, 17.0±0.2°, 18.0±0.2°, 18.9±0.2°, 19.9±0.2°, 20.0±0.2°, 20.7±0.2°, 21.7±0.2°, 22.8±0.2°, 24.2±0.2°, 25.1±0.2°, 25.8±0.2°, 26.7±0.2° and 27.6±0.2°.

In some embodiments, Compound 1 is in Form B characterized by an XRPD substantially in accordance with FIG. 4A.

I In some embodiments, Compound 1 is in Form B characterized by an XRPD summarized in Table 2.

TABLE 2
X-ray Diffraction Pattern of Compound 1 Crystalline Form B

		Diffraction		Relative
	Peak#	angle (2 theta)	Spacing	intensity

	1	6.266	14.10502	21.70
	2	9.483	9.32619	22.34
	3	11.455	7.72521	3.92
	4	12.395	7.14115	11.38
	5	12.832	6.89900	12.73
	6	13.252	6.68146	12.21
	7	15.095	5.86950	100.00
	8	15.513	5.71236	66.31
	9	16.530	5.36287	21.11
	10	17.016	5.21086	44.01
	11	18.032	4.91940	22.41
	12	18.839	4.71056	22.97
	13	18.946	4.68427	26.61
	14	19.519	4.54788	9.92
	15	19.897	4.46247	61.31
	16	20.081	4.42199	31.97
	17	20.687	4.29383	97.71
	18	21.722	4.09137	58.94
	19	22.800	3.90041	97.94
	20	24.243	3.67138	32.46
	21	24.822	3.58706	13.83
	22	25.110	3.54655	27.64
	23	25.757	3.45886	12.94
	24	26.306	3.38790	11.20
	25	26.732	3.33487	10.85
	26	27.334	3.26277	10.51
	27	27.665	3.22453	13.80
	28	28.480	3.13406	4.80
	29	29.298	3.04844	5.98
	30	29.765	3.00164	8.35
	31	30.128	2.96635	5.63
	32	30.789	2.90412	5.73
	33	31.326	2.85555	6.85
	34	31.613	2.83028	6.13
	35	32.049	2.79277	8.88
	36	32.983	2.71581	5.91
	37	34.973	2.56565	8.57
	38	37.038	2.42722	1.32
	39	38.049	2.36504	3.63

In some preferred embodiments, Compound 1 is in Form B characterized by a melting point of about 153.9±2.0° C. (onset temperature).

In some preferred embodiments, Compound 1 is in Form B characterized by a DSC substantially in accordance with FIG. 4B.

In some preferred embodiments, Compound 1 is in Form B characterized by a TGA substantially in accordance with FIG. 4B.

Also disclosed herein is a method for preparing Compound 1, such as the procedures depicted in Scheme 1. The new synthetic methods and the crystallization/recrystallization procedures of Compound A via Form A or B disclosed herein overcome many issues associated with the processes reported previously, such as preparation of the key chiral intermediate with >98% optical purity, improve the purity of Compound 1 to reach the acceptance criteria in the specification, control the impurities in Compound 1 and provide many advantages over the existing processes. Notably, the methods disclosed herein are especially suitable for reproducible, commercial-scale manufacture of Compound 1 in high quality and good yields. In an alternative process, BG-9 or its analogs in Scheme 1 could be asymmetrically reduced with low to excellent enantioselectivities (5% ee. to 95% ee). The process of other steps are similar to those listed in Scheme 1. And the absolute configurations of Compound 1 was deduced to be S from the single crystal X-ray structural analysis of intermediate BG-13.

Also disclosed herein are methods of preparing Form A or Form B.

Disclosed herein is a method of preparing Form A of Compound 1, comprising:

• • (a) Dissolving Compound 1 in amorphous form in a solvent;
  • (b) Adding an anti-solvent into the solution of step (a) to induce precipitation;
  • (c) Keeping the mixture of step (b) at a temperature of or below 25° C. to precipitate Form A.

In some embodiments, the solvent used in step (a) is C_1-4alkyl alcohol (e.g., MeOH, EtOH, isopropyl alcohol), acetone, 4-Methyl-2-pentanone, EtOAc, isopropyl acetate, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, acetonitrile, CHCl₃, dichloromethane, toluene, N,N-dimethylacetamide, dimethylsulfoxide, 1-methyl-2-pyrrolidone, or acetic acid or mixtures thereof. Preferably, the solvent used in step (a) is EtOH, acetone or EtOAc.

In some embodiments, the anti-solvent used in step (b) is an aliphatic hydrocarbon, which preferably is a hexane such as n-hexane, a heptane such as n-heptane, a cyclohexane and/or petroleum ether; and an aliphatic ether, which preferably is MTBE; or H₂O or mixtures thereof. Preferably, the anti-solvent used in step (b) is n-hexane, n-heptane, MTBE, or H₂O. More preferably, the anti-solvent used in step (b) is n-hexane or n-heptane.

The ratio of the solvent used in step (a) and the anti-solvent used in step (b) can be easily determined by a skilled person in the art once the solvent and the anti-solvent have been selected. In practice, more anti-solvent may be added to induce precipitation of the desired crystalline form. In some embodiments, the volumetric ratio of the solvent/anti-solvent ratio is from 2:1 to 1:7 or higher. Specifically, the volumetric ratio of the solvent:anti-solvent ratio is 2:1, 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, or higher, depending on whether the desired amount of crystalline form has been recovered.

The temperature at which step (a) is conducted is usually room temperature, although a higher temperature may be used to aid dissolution.

In some embodiments, the temperature at which step (c) is conducted is 25° C. In other embodiments, the temperature at which step (c) is conducted is below 25° C., such as RT, 10° C. or 5° C.

The time duration for which step (c) is conducted may be adjusted by the amount of the solids which have precipitated. The time duration may be 1 hours, 2 hours, 12 hours, 24 hours, 48 hours, 72 hours or longer.

In some embodiments, the mixture of step (b) is optionally seeded with Form A to facilitate crystallization before step (c).

In some embodiment, step (c) is conducted with stirring or agitation.

In some embodiments, Form A is solvated. In some embodiment, the solvent used in step (a) is EtOAc, and Form A is Form A as an EtOAc solvate.

In some embodiments, the resultant solvated Form A may be further converted into a different solvate by a method comprising

• • (a′) Dissolving the resultant Form A in a second solvent;
  • (b′) Adding a second anti-solvent into the solution of step (a′) to induce precipitation;
  • (c′) Keeping the mixture of step (b′) at a temperature of or below 25° C. to precipitate Form A as a different solvate.

In some embodiment, the second solvent is different from the one to dissolve Compound 1 in amorphous form, such as EtOH or acetone. In a further embodiment, the second solvent is EtOH, the anti-solvent used in step (b) is n-heptane, and Form A is Form A as a hetero-solvate of EtOH and n-heptane.

Alternatively, a method of preparing Form A of Compound 1 comprises suspending or slurrying Compound 1 in amorphous form in a liquid system at a temperature of or below 25° C. to precipitate Form A.

In some embodiments, the liquid system is at least a solvent, or at least an anti-solvent, or a mixture of at least a solvent and at least an anti-solvent. The solvent is C_1-4alkyl alcohol (e.g., MeOH, EtOH, isopropyl alcohol), acetone, 4-Methyl-2-pentanone, EtOAc, isopropyl acetate, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, acetonitrile, CHCl₃, dichloromethane, toluene, N,N-dimethylacetamide, dimethylsulfoxide, 1-methyl-2-pyrrolidone, or acetic acid or mixtures thereof. Preferably, the solvent is EtOH, acetone or EtOAc. The anti-solvent is an aliphatic hydrocarbon, which preferably is a hexane such as n-hexane, a heptane such as n-heptane, a cyclohexane and/or petroleum ether; and an aliphatic ether, which preferably is MTBE; or H₂O or mixtures thereof. Preferably, the anti-solvent is n-hexane, n-heptane, MTBE, or H₂O. More preferably, the anti-solvent is n-hexane or n-heptane.

Preferably, the liquid system is a mixture of at least a solvent and at least an anti-solvent. The ratio of the solvent and the anti-solvent can be easily determined by a skilled person in the art once the solvent and the anti-solvent have been selected. In some embodiments, the volumetric ratio of the solvent/anti-solvent ratio is from 2:1 to 1:7 or higher. Specifically, the volumetric ratio of the solvent:anti-solvent ratio is 2:1, 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, or higher.

In some embodiments, the temperature is 25° C. In other embodiments, the temperature is conducted is below 25° C., such as RT, 10° C. or 5° C. In some embodiments, the temperature is 5° C. and the liquid system is isopropyl acetate, H₂O, MTBE, n-heptane, NMP/H₂O, THF/n-heptane, 1,4-Dioxane/n-heptane, EtOAc/n-heptane, or DCM/MTBE. In other embodiments, the temperature is RT, and the liquid system is isopropyl acetate, MTBE, THF/n-heptane, 1,4-dioxane/n-heptane, EtOAc/n-heptane, or CHCl₃/MTBE.

The time duration for the suspending or slurrying procedure may be adjusted by the amount of the solids which have precipitated. The time duration may be 1 hours, 2 hours, 12 hours, 24 hours, 48 hours, 72 hours or longer.

In some embodiments, the method comprises optionally adding Form A as seeds to facilitate crystallization.

In some embodiment, the suspending or slurrying procedure is conducted with stirring or agitation.

In some embodiments, the resultant solvated Form A may be further converted into a different solvate by suspending or slurrying the resultant solvated Form A in a different liquid system at a temperature of or below 25° C.

Also disclosed herein is a method of preparing Form B of Compound 1, comprising:

• • (a) Dissolving Compound 1 in Form A or in amorphous form in a solvent;
  • (b) Adding an anti-solvent into the solution of step (a) to induce precipitation;
  • (c) Keeping the mixture of step (b) at a temperature of between 40° C. and 60° C. to precipitate Form B.

In some embodiments, the solvent used in step (a) is acetone, 4-Methyl-2-pentanone, EtOAc, isopropyl acetate, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, acetonitrile, CHCl₃, dichloromethane, toluene, N,N-dimethylacetamide, dimethylsulfoxide, 1-methyl-2-pyrrolidone, or acetic acid or mixtures thereof. Preferably, the solvent used in step (a) is THF, CHCl₃, acetone or EtOAc.

In some embodiments, the anti-solvent used in step (b) is an aliphatic hydrocarbon, which preferably is a hexane such as n-hexane, a heptane such as n-heptane, a cyclohexane and/or petroleum ether; and an aliphatic ether, which preferably is MTBE; or H₂O or mixtures thereof. Preferably, the anti-solvent used in step (b) is n-hexane, n-heptane, MTBE, or H₂O. More preferably, the anti-solvent used in step (b) is n-hexane or n-heptane or MTBE.

The ratio of the solvent used in step (a) and the anti-solvent used in step (b) can be easily determined by a skilled person in the art once the solvent and the anti-solvent have been selected. In practice, more anti-solvent may be added to induce precipitation of the desired crystalline form. In some embodiments, the volumetric ratio of the solvent/anti-solvent ratio is from 2:1 to 1:7 or higher. Specifically, the volumetric ratio of the solvent:anti-solvent ratio is 2:1, 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, or higher, depending on whether the desired amount of crystalline form has been recovered.

The temperature at which step (a) is conducted is usually room temperature, although a higher temperature may be used to aid dissolution.

In some embodiments, the temperature at which step (c) is conducted is between 50° C. to 60° C. In other embodiments, the temperature at which step (c) is conducted is 50° C. or 55° C.

The time duration for which step (c) is conducted may be adjusted by the amount of the solids which have precipitated. The time duration may be 1 hours, 2 hours, 12 hours, 24 hours, 48 hours, 72 hours or longer.

In some embodiments, the mixture of step (b) is optionally seeded with Form B to facilitate crystallization before step (c).

In some embodiments, the resultant Form B is anhydrous non-solvated.

Alternatively, a method of preparing Form B of Compound 1 comprises suspending or slurrying Compound 1 in amorphous form or in Form A in a liquid system at a temperature of between 40° C. and 60° C. to precipitate Form B.

In some embodiments, the liquid system is at least a solvent, or at least an anti-solvent, or a mixture of at least a solvent and at least an anti-solvent. The solvent is acetone, 4-Methyl-2-pentanone, EtOAc, isopropyl acetate, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, acetonitrile, CHCl₃, dichloromethane, toluene, N,N-dimethylacetamide, dimethylsulfoxide, 1-methyl-2-pyrrolidone, or acetic acid or mixtures thereof. Preferably, the solvent is EtOH, acetone or EtOAc. The anti-solvent is an aliphatic hydrocarbon, which preferably is a hexane such as n-hexane, a heptane such as n-heptane, a cyclohexane and/or petroleum ether; and an aliphatic ether, which preferably is MTBE; or mixtures thereof. Preferably, the anti-solvent is n-hexane, n-heptane, MTBE. More preferably, the anti-solvent is n-hexane or n-heptane.

Preferably, the liquid system is a mixture of at least a solvent and at least an anti-solvent, preferably EtOAc/n-hexane, EtOAc/n-hexane, Acetone/n-heptane, THF/n-heptane, CHCl₃/n-heptane, CHCl₃/MTBE, or Acetone/MTBE.

The ratio of the solvent and the anti-solvent can be easily determined by a skilled person in the art once the solvent and the anti-solvent have been selected. In some embodiments, the volumetric ratio of the solvent/anti-solvent ratio is from 2:1 to 1:7 or higher. Specifically, the volumetric ratio of the solvent:anti-solvent ratio is 2:1, 1:1, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, or higher. Preferably, the liquid is EtOAc/n-hexane (1:1), EtOAc/n-hexane (1:3), Acetone/n-heptane (1:3), THF/n-heptane (1:3), CHCl₃/n-heptane (1:3), CHCl₃/MTBE (1:5). or Acetone/MTBE (1:5).

In some embodiments, the temperature for slurrying or suspending is between 50° C. to 60° C. In other embodiments, the temperature for slurrying or suspending is conducted is 50° C. or 55° C.

The time duration for the suspending or slurrying procedure may be adjusted by the amount of the solids which have precipitated. The time duration may be 1 hours, 2 hours, 12 hours, 24 hours, 48 hours, 72 hours or longer.

In some embodiments, the method comprises optionally adding Form B as seeds to facilitate crystallization.

In some embodiment, the suspending or slurrying procedure is conducted with stirring or agitation.

Also disclosed herein is a pharmaceutical composition comprises a therapeutically effective amount of Form A or B, and a pharmaceutically acceptable excipient. In some embodiments, the pharmaceutical composition is used in an oral administration. In some preferred embodiments, the pharmaceutical composition comprises 1 wt % to 99 wt % of Form A or B. In some more preferred embodiments, the pharmaceutical composition comprises 1 wt % to 70 wt % of Form A or B. In some most embodiments, the pharmaceutical composition comprises 10 wt % to 30 wt % of Form A or B.

Disclosed herein is a method of treating or preventing a disease associated with undesirable Btk activity in a subject by administering to a subject Form A or B.

Disclosed herein is a method of treating or preventing a disease selected from an allergic disease, an autoimmune disease, an inflammatory disease, a cancer, or a combination of two or more thereof in a subject by administering to the subject Form A or B.

Disclosed herein is a method of treating or preventing a B-cell proliferative disease, selected from chronic lymphocytic, non-Hodgkin's lymphoma, diffuse large B cell lymphoma, mantle cell lymphoma, follicular lymphoma, chronic lymphocytic leukemia, or a combination of two or more thereof in a subject by administering to the subject Form A or B.

Form A or B disclosed herein can be used in manufacturing a medicament for treatment of at least one disease associated with undesirable Btk activity, in a subject.

Form A or B disclosed herein can be used in manufacturing a medicament for the treatment of a disease selected from an allergic disease, an autoimmune disease, an inflammatory disease, a cancer, or a combination of two or more thereof, in a subject.

Form A or B disclosed herein can be used in manufacturing a medicament for the treatment of a B-cell proliferative disease selected from chronic lymphocytic, non-Hodgkin's lymphoma, diffuse large B cell lymphoma, mantle cell lymphoma, follicular lymphoma, chronic lymphocytic leukemia, or a combination of two or more thereof, in a subject.

Definitions

Unless specifically defined elsewhere in this document, all other technical and scientific terms used herein have the meaning commonly understood by one of ordinary skill in the art to which this invention belongs.

As used herein, including the appended claims, the singular forms of words such as “a”, “an”, and “the”, include their corresponding plural references unless the context clearly dictates otherwise. Thus, for example, reference to “a crystalline form” includes one or more of such different crystalline forms and reference to “the method” includes reference to equivalent steps and methods know to those of ordinary skill in the art that could be modified or substituted for the methods described herein.

As disclosed herein, the crystalline form is an approximately pure crystalline. The term “approximately pure” as herein used refers to at least 85 wt %, preferably at least 95 wt %, more preferably at least 99 wt % of Form A or B disclosed herein.

For crystalline forms disclosed herein, only the main peaks (i.e., the most characteristic, significant, unique and/or reproducible peaks) are summarized; additional peaks may be obtained from the diffraction spectra by conventional methods. The main peaks described above can be reproduced within the margin of error (±2 at the last given decimal place, or ±0.2 at the stated value).

As disclosed herein, “an XRPD substantially in accordance with FIG. 2A” refers to the XRPD that show major peaks as in FIG. 2A, wherein major peaks refer to those with the relative intensity greater than 10%, preferably greater than 20%, relative to the highest peak (with its relative intensity designated to be 100%) in FIG. 2A.

The term “solvent” used herein refers to a liquid in which Compound 1 or Form A or Form B is dissolved or partially dissolved at RT with the solubility greater than 2 mg/mL at RT, preferably greater than 10 mg/mL at RT. Examples of the solvent in which Compound 1 in either amorphous form or Form A or Form B is dissolvable or partially dissolvable include, but no limited to, C_1-4alkyl alcohol (e.g., MeOH, EtOH, isopropyl alcohol), acetone, 4-Methyl-2-pentanone, EtOAc, isopropyl acetate, tetrahydrofuran, 2-methyltetrahydrofuran, 1,4-dioxane, acetonitrile, CHCl₃, dichloromethane, toluene, N,N-dimethylacetamide, dimethylsulfoxide, 1-methyl-2-pyrrolidone, acetic acid and so on.

The term “anti-solvent” used herein refers to a liquid which can induce precipitation for crystallization of Form A or Form B and in which the solubility of Form A or Form B is less than 2 mg/mL at RT. Examples of the anti-solvent which induces precipitation for crystallization of Form A or Form B include, but not limited to, an aliphatic hydrocarbon, which preferably is a hexane such as n-hexane, a heptane such as n-heptane, a cyclohexane and/or petroleum ether; and an aliphatic ether, which preferably is MTBE; H₂O and mixtures thereof. Preferably, the anti-solvent for Form A or Form B is n-hexane, n-heptane, MTBE, or H₂O.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word “comprise”, and variations such as “comprises” and “comprising”, will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integer or step. When used herein the term “comprising” can be substituted with the term “containing” or sometimes when used herein with the term “having”.

The term “therapeutically effective amount” as herein used, refers to the amount of a compound that, when administered to a subject for treating a disease, or at least one of the clinical symptoms of a disease or disorder, is sufficient to affect such treatment for the disease, disorder, or symptom. The “therapeutically effective amount” can vary with the compound, the disease, disorder, and/or symptoms of the disease or disorder, severity of the disease, disorder, and/or symptoms of the disease or disorder, the age of the subject to be treated, and/or the weight of the subject to be treated. An appropriate amount in any given instance can be apparent to those skilled in the art or can be determined by routine experiments. In the case of combination therapy, the “therapeutically effective amount” refers to the total amount of the combination objects for the effective treatment of a disease, a disorder or a condition.

The pharmaceutical composition comprising the compound disclosed herein can be administrated via oral, inhalation, rectal, parenteral or topical administration to a subject in need thereof. For oral administration, the pharmaceutical composition may be a regular solid formulation such as tablets, powder, granule, capsules and the like, a liquid formulation such as water or oil suspension or other liquid formulation such as syrup, solution, suspension or the like; for parenteral administration, the pharmaceutical composition may be solution, water solution, oil suspension concentrate, lyophilized powder or the like. Preferably, the formulation of the pharmaceutical composition is selected from tablet, coated tablet, capsule, suppository, nasal spray or injection, more preferably tablet or capsule. The pharmaceutical composition can be a single unit administration with an accurate dosage. In addition, the pharmaceutical composition may further comprise additional active ingredients.

All formulations of the pharmaceutical composition disclosed herein can be produced by the conventional methods in the pharmaceutical field. For example, the active ingredient can be mixed with one or more excipients, then to make the desired formulation. The “pharmaceutically acceptable excipient” refers to conventional pharmaceutical carriers suitable for the desired pharmaceutical formulation, for example: a diluent, a vehicle such as water, various organic solvents, etc, a filler such as starch, sucrose, etc a binder such as cellulose derivatives, alginates, gelatin and polyvinylpyrrolidone (PVP); a wetting agent such as glycerol; a disintegrating agent such as agar, calcium carbonate and sodium bicarbonate; an absorption enhancer such as quaternary ammonium compound; a surfactant such as hexadecanol; an absorption carrier such as Kaolin and soap clay; a lubricant such as talc, calcium stearate, magnesium stearate, polyethylene glycol, etc. In addition, the pharmaceutical composition further comprises other pharmaceutically acceptable excipients such as a decentralized agent, a stabilizer, a thickener, a complexing agent, a buffering agent, a permeation enhancer, a polymer, aromatics, a sweetener, and a dye.

The term “disease” refers to any disease, discomfort, illness, symptoms or indications, and can be interchangeable with the term “disorder” or “condition”.

Abbreviations:

• • AcOH Acetic acid
  • Con. Concentrated
  • D-DBTA (2S, 3S)-Dibenzoyl tartaric acid
  • DCM Dichloromethane
  • DIEA N,N-diisopropylethylamine
  • DMF N,N-dimethylformamide
  • DMF-DMA N,N-dimethylformamide dimethyl acetal
  • DSC Differential Scanning Calorimetry
  • DVS Dynamic Vapor Sorption
  • EtOAc Ethyl Acetate
  • EDCI 1-Ethyl-3-(3-dimethylaminopropyl)carbodiimide
  • GC Gas Chromatograph
  • GCMS Gas Chromatography-Mass Spectrometry
  • HATU 1-[Bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium 3-oxide, hexafluorophosphate
  • HOAc Acetic Acid
  • HOBt Hydroxybenzotriazole
  • HPLC High Performance Liquid Chromatography
  • L-DBTA (2R, 3R)-Dibenzoyl tartaric acid
  • ACN Acetonitrile
  • MeOH Methanol
  • MeMgBr Methyl Magnesium Bromide
  • MsOH Methanesulfonic Acid
  • MTBE Methyl tertiary butyl ether
  • NLT not less than
  • NMP 1-Methyl-2-pyrrolidone
  • NMR Nuclear Magnetic Resonance
  • NMT not more than
  • Pd Palladium
  • RH Relative Humidity
  • RT or rt Room Temperature (20±2° C.)
  • TEA Triethylamine
  • TGA Thermo-gravimetric Analysis
  • THF Tetrahydrofuran
  • XRPD X-ray Powder Diffraction

EXAMPLES

The examples below are intended to be purely exemplary and should not be considered to be limiting in any way. Efforts have been made to ensure accuracy with respect to numbers used (for example, amounts, temperature, etc.), but some experimental errors and deviations should be accounted for. Unless indicated otherwise, temperature is in degrees Centigrade.

The proton nuclear magnetic resonance (¹H-NMR) or carbon nuclear magnetic resonance (¹³C-NMR) spectra was collected on a Agilent instrument operating at 400 MHz. ¹HNMR spectra were obtained using CDCl₃, CD₂Cl₂, CD₃OD, D₂O, d₆-DMSO, d₆-acetone or (CD₃)₂CO as solvent and tetramethylsilane (0.00 ppm) or residual solvent (CDCl₃: 7.25 ppm; CD₃OD: 3.31 ppm; D₂O: 4.79 ppm; d₆-DMSO: 2.50 ppm; d₆-acetone: 2.05; (CD₃)₂CO: 2.05) as the reference standard. When peak multiplicities are reported, the following abbreviations are used: s (singlet), d (doublet), t (triplet), q (quartet), qn (quintuplet), sx (sextuplet), m (multiplet), br (broadened), dd (doublet of doublets), dt (doublet of triplets). Coupling constants, when given, are reported in Hertz (Hz).

The crystalline form is characterized by X-ray powder diffraction (XRPD) pattern method, which is conducted on a PANalytical Empyrean X-ray powder diffractometer with the XRPD parameters as follows:

	Parameters for Reflection Mode
X-Ray wavelength	Cu, kα, Kα1 (Å): 1.540598, Kα2 (Å): 1.544426
	Kα2/Kα1 intensity ratio: 0.50
X-Ray tube setting	45 kV, 40 mA
Divergence slit	Automatic
Scan mode	Continuous
Scan range (° 2TH)	3°-40°
Step size (° 2TH)	0.0130
Scan speed (°/min)	About 10

The thermo-gravimetric analysis (TGA) curves are generated on a TA Q500/Q5000 TGA from TA Instruments. DSC and mDSC curves are generated on a TA Q2000 DSC from TA Instruments. Detailed parameters are listed below:

Parameters	TGA	DSC	mDSC
Temperature range	RT-350° C.	RT-320° C.	35-150 ° C.
Ramp rate
	10° C./min	10° C./min	3° C./min
Purge gas	N2	N2	N2
Pan Form	Aluminum,	Aluminum,	Aluminum,
	open	crimped	crimped

The dynamic vapor sorption (DVS) plots are collected via a SMS (Surface Measurement Systems) DVS Intrinsic. The relative humidity at 25° C. is calibrated against deliquescence point of LiCl, Mg(NO₃)₂ and KCl. Detailed parameters are listed below:

	Parameters	DVS

Temperature

	25°	C.
	Sample size
	10~20	mg

	Gas and flow rate	N2, 200 mL/min
	dm/dt	0.002%/min

	Min dm/dt stability duration	10	min
	Max. equilibrium time	180	min

RH range

	0% RH to 95% RH
	RH step size	10% RH from 0% RHto 90% RH
		5% RH from 90% RH to 95% RH

Example 1: Preparation of (S)-7-(1-(but-2-ynoyl)piperidin-4-yl)-2-(4-phenoxy phenyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine-3-carboxamide (Compound 1) Step 1: Synthesis of BG-2

Under nitrogen atmosphere, TEA (2.4 eq.) was added at 10° C. to a solution of EtOAc (5 v), HOBT (1.2 eq.), EDCI (1.2 eq.), 4-phenoxybenzoic acid (BG-1, 80 Kg, 1.0 eq.) and malononitrile (1.2 eq.). The mixture was then stirred at RT until the reaction was completed. The mixture was then centrifuged and the cake was washed with EtOAc. The filtrate was washed with aqueous NaHCO₃ twice and NH₄Cl. The organic phase was washed with 1.5 N H₂SO₄ twice and stirred. The mixture was concentrated, and precipitated from methanol and purified water. The solid was collected by centrifugation and then dried under vacuum to give 79.9 Kg of BG-2. ¹H NMR (DMSO-d₆) δ 7.62 (d, J=8.6 Hz, 2H), 7.46-7.38 (m, 2H), 7.18 (t, J=7.4 Hz, 1H), 7.06 (d, J=8.0 Hz, 2H), 6.94 (d, J=8.6 Hz, 2H).

Step 2: Synthesis of BG-3

Under nitrogen atmosphere, a solution of BG-2 (79.9 kg, 1.0 eq.) in ACN (5.0 v) was added into trimethoxymethane (12.0 v) at 85° C. The resultant mixture was stirred until the reaction was completed. The mixture was sampled for HPLC analysis, and concentrated under vacuum. The residue was precipitated from i-PrOH and hexane. The mixture was centrifuged, and the cake was washed with hexane and dried under vacuum. This gave 71.7 Kg of BG-3. ¹H NMR (400 MHz, DMSO-d₆) δ 7.70 (d, J=8.4 Hz, 2H), 7.52-7.45 (m, 2H), 7.28 (t, J=7.6 Hz, 1H), 7.22-7.06 (m, 4H), 3.93 (s, 3H).

Step 3: Synthesis of BG-4

Under nitrogen atmosphere, hydrazinium hydroxide (1.0 eq.) in ethanol (0.6 v) was charged dropwise to a solution of BG-3 (71.6 kg, 1.0 eq.) in ethanol (2.5 v) in the reactor below 15° C. The solution was heated to RT and stirred until the reaction was completed. Water (4.0 v) was added to the reactor. The solution was then cooled to 5° C., centrifuged and the cake was washed with water (1.0 v). The cake was dried under vacuum. This gave 66.9 Kg of BG-4. ¹H NMR (DMSO-d₆) δ 12.11 (br s, 1H), 7.80 (d, J=8.8 Hz, 2H), 7.46-7.39 (m, 2H), 7.18 (t, J=7.6 Hz, 1H), 7.12-7.04 (m, 4H), 6.43 (br s, 2H).

Steps 4 to 6: Synthesis of BG-8

To a mixture of DCM (8.0 v), BG-5 (80.0 Kg, 1.0 eq.), N,O-dimethylhydroxylamine hydrochloride (1.2 eq.), HOBt (1.2 eq.) and EDCI (1.2 eq.), TEA (2.6 eq.) was charged dropwise below 15° C. the mixture was stirred at RT until the reaction was completed, centrifuged and the cake was washed with DCM (1.0 v) twice. The filtrate was washed with 20% aqueous NH₄Cl (3*4.0 v). The filtrate was concentrated under vacuum to give the crude product BG-6, which was used in the next step without further purification. The residue was dissolved in toluene (5.0 v) and THF (1.0 v), cooled to 10° C., charged dropwise MeMgBr (1.4 eq.) at 10° C. and then stirred at RT until the reaction was completed. The solution was cooled below 10° C. Saturated aqueous NH₄Cl was charged dropwise below 10° C. The mixture was centrifuged, separated, filtrated, and the organic phase was washed with aqueous NaCl twice. The organic phase was concentrated to give the crude product, which was used in the next step without further purification. The residue in DMF (2.5 v) and DMF-DMA (2.5 v) was stirred at 110° C. until the reaction was completed. The reaction mixture was cooled, concentrated and then DCM was added. The final mixture was washed with saturated aqueous NH₄Cl. The organic layer was concentrated and precipitated by charging hexane. The mixture was centrifuged and the cake was collected. The cake was dried under vacuum. This gave 82.2 Kg of the desired product. ¹H NMR (DMSO-d₆) δ 7.49 (d, J=12.6 Hz, 1H), 5.01 (d, J=12.6 Hz, 1H), 3.99-3.82 (m, 2H), 3.14-2.94 (m, 2H), 2.89-2.61 (m, 6H), 2.49-2.37 (m, 1H), 1.66-1.56 (m, 2H), 1.39 (s, 9H), 1.39-1.20 (m, 2H).

Step 7: Synthesis of BG-9

Under nitrogen atmosphere, a mixture of toluene (8.0 v), AcOH (0.5 v), BG-8 (1.2 eq.) and BG-4 (66.9 Kg 1.0 eq.) was heated to 95° C. and stirred until the reaction was completed. The mixture was cooled, concentrated and precipitated from methanol. The mixture was centrifuged and the cake was washed with methanol. The cake was dried under vacuum. This gave 107.8 Kg of BG-9. ¹H NMR (DMSO-d₆) δ 8.78 (d, J=4.6 Hz, 1H), 8.15-8.07 (m, 2H), 7.51-7.41 (m, 2H), 7.34 (d, J=4.6 Hz, 1H), 7.27-7.19 (m, 3H), 7.17-7.10 (m, 2H), 4.24-4.02 (m, 2H), 3.81-3.69 (m, 1H), 3.12-3.82 (m, 2H), 2.15-2.04 (m, 2H), 1.76-1.60 (m, 2H), 1.43 (s, 9H).

Step 8: Synthesis of BG-10

To a mixture of THF (10.0 v), BG-9 (13.0 Kg, 1.0 eq.) and D-DBTA (1.0 eq.) under N₂ was charged Pd/C (10% w/w), hydrogen gas was introduced into the reactor and the hydrogen pressure was maintained to 1.8 MPa. The reactor was heated to 40° C. slowly and stirred until the reaction was completed. The mixture was then cooled, filtered, and the cake was washed with THF. The filtrate was collected, and concentrated under vacuum. DCM was added. The residue was washed with aq. NaHCO₃, concentrated and precipitated from MTBE and hexane, then centrifuged. The cake was collected and dried under vacuum to give the desired compound (yield: 94.8% and purity: 98.5%). ¹H-NMR (DMSO-d₆) δ 7.82-7.76 (m, 2H), 7.56-7.51 (m, 1H), 7.45-7.37 (m, 2H), 7.21-7.14 (m, 1H), 7.12-7.03 (m, 4H), 4.09-3.91 (m, 3H), 3.30-3.22 (m, 2H), 2.82-2.55 (m, 2H), 2.18-1.99 (m, 2H), 1.98-1.86 (m, 1H), 1.69-1.58 (m, 1H), 1.56-1.45 (m, 1H), 1.38 (s, 9H), 1.32-1.13 (m, 2H).

Step 9: Synthesis of BG-11

To a solution of BG-10 (100.0 Kg 1.0 eq.) in DCM (6.0 v) was added dropwise HCl in EtOH (20.9% w/w, 2.0 v) under nitrogen atmosphere. The mixture is stirred until the reaction was completed. MTBE (4.0 v) was added to the solution, cooled. The cakes was collected by centrifugation and washed with hexane (2.0 V), then the cake was slurried in hexane (5 v), and centrifuged again. The cake was washed with hexane (2.0 V) and dried under vacuum. This gave 85.2 Kg of BG-11. ¹H-NMR (DMSO-d₆) δ 9.25-8.85 (m, 2H), 7.84-7.70 (m, 2H), 7.47-7.37 (m, 2H), 7.18 (t, J=7.4 Hz, 1H), 7.12-7.03 (m, 4H), 5.73 (br s, 2H), 4.12-4.03 (m, 1H), 3.25-3.19 (m, 4H), 2.90-2.73 (m, 2H), 2.28-2.12 (m, 1H), 2.10-2.00 (m, 1H), 1.99-1.86 (m, 1H), 1.84-1.52 (m, 4H).

Step 10: Synthesis of BG-11A

A mixture of BG-11 (85.0 Kg, 1.0 eq.) in water (6.0 v) and NaOH (3.0 eq.) was stirred until the reaction was completed at RT. The cake was collected and slurried in MTBE (6.0 v). The mixture was then centrifuged to collect the cake. The cake was dried under vacuum. This gave 71.3 Kg of BG-11A. ¹H-NMR (DMSO-d₆) δ 7.82-7.74 (m, 2H), 7.54-7.49 (m, 1H), 7.45-7.38 (m, 2H), 7.21-7.14 (m, 1H), 7.12-7.04 (m, 4H), 4.03-3.95 (m, 1H), 3.29-3.21 (m, 2H), 3.00-2.87 (m, 2H), 2.46-2.31 (m, 2H), 2.11-1.83 (m, 3H), 1.58-1.12 (m, 4H).

Step 11: Synthesis of BG-11B

A mixture of ethanol/water/acetic acid (7:3:1, 46 v) and BG-11A (30 kg, 1.0 eq.) in a reactor was heated to 70±5° C. under nitrogen atmosphere, then a solution of D-DBTA (1.20 eq.) in ethanol/water/acetic acid (7:3:1, 4 v) was added dropwise with the temperature not less than 65° C. The resulting solution was stirred for 16 hrs at 60-65° C., then cooled to RT. The solid was collected by centrifugation and washed with ethanol (2.0 v). The cake was slurried in the mixed solvent of ethanol/water/AcOH (7:3:1, 20 v) for 16 hrs at 55° C. and cooled to RT. The solid was collected by centrifugation, washed with ethanol (2.0 v). The cake was dried under vacuum (Yield: 37.9%) to give the desired product. ¹H-NMR (DMSO-d₆) δ 8.76 (br s, 2H), 7.99-7.89 (m, 4H), 7.83-7.75 (m, 2H), 7.66-7.57 (m, 3H), 7.52-7.45 (m, 4H), 7.45-7.39 (m, 2H), 7.21-7.14 (m, 1H), 7.13-7.03 (m, 4H), 5.64 (s, 2H), 4.08-4.00 (m, 1H), 3.29-3.19 (m, 4H), 2.85-2.72 (m, 2H), 2.21-1.40 (m, 7H).

Step 12: Synthesis of BG-11C

To a mixture of dichloromethane (15.0 v) and 20.0% aqueous KOH (3.0 v) was added batchwise BG-11B (48.0 kg, 1.0 eq.) under nitrogen atmosphere at RT. After the reaction was completed, the organic layer was collected and the water layer was extracted with dichloromethane (5.0 v). The organic layers were combined. Con. HCl (0.36 v) was added to the above organic layers at RT. The resulting mixture was stirred until the reaction was completed. The solid was collected by centrifugation and washed with dichloromethane (1.0 v). The collected solid was slurried with MTBE (6.0 v). The solid was collected by centrifugation and washed with MTBE (1.0 v), then was dried under vacuum. This gave 31.5 Kg product (Yield: 100%).

Step 12: Synthesis of BG-11D (Alternative Intermediate)

ACN (5.0 v), soft water (10.0 v), KOH (5.0 eq.) was charged to a reactor and stirred for at least 15 min. BG-11B (1.0 eq.) was charge to the reactor in portion-wise. The mixture was stirred until the reaction was completed. The cake was collected by centrifugation, slurried in ACN (1.0 v) and soft water (5.0 v), and dried under vacuum to give the product.

Step 13: Synthesis of BG-12

A solution of BG-11C (15.0 Kg 1.0 eq.) in MsOH (2.5 v) was stirred at 85° C. under nitrogen atmosphere until the reaction was completed. After cooling to 5° C. purified water (4.0 v) was added dropwise to the system and kept the temperature not more than 35° C. (temperature increased obviously). The resulting solution was stirred for 16 hrs at 30° C., and then washed with DCM (2*3.0 v). The aqueous phase was collected. DCM (6.0 v) was added to the aqueous phase, the mixture was cooled to 5° C. The pH value was adjusted to 11-12 with 20% aqueous NaOH (temperature increased obviously) with stirring with the temperature not more than 30° C. The organic phase was separated and collected. The aqueous phase was extracted with DCM (3.0 v). The organic layers were combined and concentrated. MTBE (4.0 v) was added to the residue. The mixture was then concentrated and precipitated from n-heptane. The solid was collected by centrifugation and dried in a vacuum oven. This gave 12.55 Kg of BG-12 (Yield: 94.9%). ¹H-NMR (DMSO-d₆) δ 7.52-7.46 (m, 2H), 7.45-7.38 (m, 2H), 7.21-7.13 (m, 1H), 7.12-7.03 (m, 4H), 6.64 (s, 1H), 3.99-3.90 (m, 1H), 3.29-3.22 (m, 2H), 3.03-2.90 (m, 2H), 2.48-2.36 (m, 2H), 2.03 (dd, J=13.9, 5.6 Hz, 2H), 2.14-1.99 (m, 1H), 1.97-1.85 (m, 1H), 1.65-1.15 (m, 3H).

Step 14: Synthesis of BG-13

A mixture of MeOH (13.5 v), purified water (4.5 v) and BG-12 (8.5 Kg, 1.0 eq.) in a reactor was heated to 50° C. under N₂ atmosphere. To the mixture was charged dropwise a solution of L-DBTA (0.7 eq.) in MeOH/purified water (1.5 v/0.5 v) while keeping the temperature at 50° C. After addition, the mixture was stirred for at least 2 hrs at 50° C., and then cooled to RT and stirred for at least 16 hrs at RT. The cake was collected by centrifugation and was washed with MeOH (2.0 v). The cake was dried in a vacuum oven. This gave 9.08 Kg of BG-13 (Yield: 74.8%).

Step 15: Synthesis of (S)-7-(1-(but-2-ynoyl)piperidin-4-yl)-2-(4-phenoxyphenyl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine-3-carboxamide (Compound 1)

Under N₂ atmosphere, BG-13 (6.0 Kg; 1.0 eq) was stirred in charged DCM (30 L; 5.0 v) with the presence of 5% w/w aq. NaOH (0.48 Kg; 1.2 eq.) at around 30° C. until the reaction was completed. Separated and collected organic layer. The aqueous layer was further extracted with DCM. All organic layers were combined and washed with 15% brine for twice.

The organic layer was collected and concentrated under vacuum. To the residue was added but-2-ynoic acid (0.89 Kg; 1.05 eq.), HATU (4.21 Kg; 1.1 eq.) under N₂ atmosphere. The mixture was heated to 35˜40° C. To the mixture was added dropwise TEA (3.05 Kg; 3.0 eq.; dissolved with DCM (12.0 L; 2.0 v)). The reaction was stirred until the reaction was completed.

The reaction system was concentrated under vacuum and swapped to DMF solution. Water (506.8 L; 40.0 v) was added dropwise to precipitate the solid. Centrifuged, collected the cake. The cake was dissolved in DCM and washed with 8% NaHCO₃ and 15% brine to remove DMF residue. The organic layer was concentrated and purified by silica gel (100-200 mesh column, eluted with heptane, followed by 1.2% w/w % methanol in DCM). The solution of Compound 1 was collected, concentrated and precipitate from DMF and water. The residual was centrifuged, and collected to give the crude product of Compound 1, which was confirmed to be amorphous.

Example 2: Preparation of Form A of Compound 1

The crude product of Compound 1 prepared in the above Example 1 was dissolved in 5.0 volumes of DCM. The resultant solution was washed with water (3.0 volumes*2). The organic phase was concentrated and swapped to EtOAc (no more than 2 volumes). The solution was further charged with EtOAc to 4.5 volumes. 27.5% w/w n-heptane in EtOAc (12.0 v) (the volume/volume ratio of EtOAc:n-heptane is about 2:1) was added dropwise to the system while the temperature was kept at RT. The system was then stirred for at least 24 hours at RT, centrifuged and collected the cake to obtain the resultant product in solid form.

The solid was then subject to various characterizations including XRPD (FIG. 2A), TGA/DSC (FIG. 2B) and ¹H NMR (FIG. 2C). ¹H-NMR (DMSO-d₆) δ 7.56-7.47 (m, 2H), 7.46-7.37 (m, 2H), 7.22-7.13 (m, 1H), 7.13-7.02 (m, 4H), 6.67 (s, 1H), 4.45-4.20 (m, 2H), 4.09-3.95 (m, 1H), 3.33-3.26 (m, 2H), 3.17-2.95 (m, 1H), 2.70-2.52 (m, 1H), 2.36-2.18 (m, 1H), 2.00 (s, 3H), 2.12-1.85 (m, 2H), 1.83-1.66 (m, 1H), 1.65-1.51 (m, 1H), 1.37-1.06 (m, 2H).

The XRPD results found the resultant solid as a crystalline form (designated as Form A). The DSC result showed an endotherm at 87.5° C. before decomposition at 274.8° C. The TGA result showed a weight loss of 8.42% up to 150° C. After desolvation via heating in TGA, amorphous was produced (FIG. 2D). The ¹H NMR result showed an EtOAc content of around 9.1%, consistent with TGA weight loss. The above ¹H-NMR and TGA heating confirmed Form A as an EtOAc solvated crystalline form (sometimes referred to as Form A as an EtOAc solvate) wherein the molar ratio of Compound 1 and EtOAc is about 2:1.

Example 3: Preparation of Other Form A of Compound 1

About 15 mg of Form A as an EtOAc solvate as prepared in Example 2 was dissolved in the respective solvent (0.40 mL EtOH or 0.15 mL acetone) to obtain a saturated solution at room temperature. The resultant solution was magnetically stirred, then followed by addition of n-heptane as the anti-solvent (2.4 mL n-heptane for EtOH and 0.4 mL n-heptane for acetone, respectively) to induce precipitation. The respective precipitate was isolated for XRPD analysis.

The XRPD analysis found the product obtained from crystallization from EtOH/n-heptane and the product obtained from crystallization from acetone/n-heptane are crystalline; see FIG. 3A.

It is interesting to note that FIG. 3A shows that the XRPD patterns of Form A obtained from 2:1 EtOAc/n-heptane (v/v) in Example 2, Form A obtained from EtOH/n-heptane and Form A obtained from acetone/n-heptane comprise the diffraction peaks of substantially the same positions, although their relative intensities vary.

Alternatively, Form A with increased crystallinity was prepared by slurry of amorphous in EtOH/n-heptane (1:3, v/v) at RT, as shown in FIG. 3B (also confirmed the crystalline structure of Form A, referred to as Form A obtained from slurry conversion of EtOH/n-heptane). The TGA curve of Form A obtained from slurry conversion of EtOH/n-heptane in FIG. 3C showed a two-step loss of 6.8% up to 150° C. The ¹H-NMR result of Form A obtained from slurry conversion of EtOH/n-heptane in FIG. 3D showed an EtOH content of 0.4% and n-heptane content of 4.4% without EtOAc residual. After desolvation via TGA heating, amorphous was also produced as shown in FIG. 3E.

The ¹H-NMR and TGA heating for Form A obtained from slurry conversion from EtOH/n-heptane also confirmed the resultant Form A as a solvated crystalline form, in particular, Form A as a hetero-solvate of EtOH and n-heptane.

Example 4: Preparation Crystalline Form B of Compound 1

To the reactor was charged Form A of Compound 1 (1.0 eq.) prepared in the above Example 2, EtOAc (7.5 v) and n-heptane (7.5 v). The mixture was heated to 55-60° C. and stirred at least 72 h. The mixture was then cooled to 10-15° C. and stirred for at least 15 min. The cake was collected after centrifugation and washed with n-heptane to give a solid (yield 52.2%).

The resultant solid was then subject to various characterizations including XRPD (FIG. 4A), TGA/DSC (FIG. 4B), ¹H NMR (FIG. 4C) and ¹³C-NMR (DMSO-d₆) (FIG. 4D). ¹H-NMR (DMSO-d₆) δ 7.56-7.47 (m, 2H), 7.46-7.37 (m, 2H), 7.22-7.13 (m, 1H), 7.13-7.02 (m, 4H), 6.67 (s, 1H), 4.45-4.20 (m, 2H), 4.09-3.95 (m, 1H), 3.33-3.26 (m, 2H), 3.17-2.95 (m, 1H), 2.70-2.52 (m, 1H), 2.36-2.18 (m, 1H), 2.00 (s, 3H), 2.12-1.85 (m, 2H), 1.83-1.66 (m, 1H), 1.65-1.51 (m, 1H), 1.37-1.06 (m, 2H).

The XRPD result found the resultant solid as a crystalline form different from the above Form A (designated as Form B). The DSC result showed a neat melting endotherm at 153.9° C. (onset temperature). The TGA result showed a two-step weight loss of 2.3% up to 140° C., indicating Form B is anhydrous non-solvated. The ¹H-NMR showed no solvent residual EtOAc that appeared in Form A, which is consistent with the TGA result.

Example 5: Preparation of Crystalline Form B of Compound 1 Example 5A: Preparation from Form A of Compound 1

250 mg of Form A of Compound 1 prepared in the above Example 2 was charged into a 20-mL glass vial. 2.0 mL of THF was added into the vial and stirred at RT until all solids were dissolved. 2.0 mL of n-heptane was added to induce precipitate and the mixture was equilibrated at RT for 1 hr. About 4 mg of Form B prepared in the above Example 4 was added as seed and the mixture was stirred at RT for 1.5 hrs. Additional 4.0 mL of n-heptane was added to induce more solids and transfer to 50° C. agitation for 1 hr. About 4 mg of Form B prepared in the above Example 4 was added again as seed and the mixture was stirred at 50° C. for 22 hrs. The cake was then collected by vacuum filter and was dried at 50° C. for 16 hrs to obtain the solid (169.5 mg, yield of ˜74%).

Example 5B: Preparation from Compound 1 in Amorphous Form

250 mg of Compound 1 in amorphous form prepared in Example 1 was added into a 20-mL glass vial. 1.0 mL of THF was added into the vial and stirred at RT until all solids were dissolved. 1.0 mL of n-heptane was added to induce precipitate. The mixture was equilibrated at RT for 1 hr. About 4 mg of Form B of Compound 1 prepared in the above Example 4 was added as seed and the mixture was stirred at RT for 1.5 hrs. Additional 2.0 mL of n-heptane was added to induce more solids. About 4 mg of Form B of Compound 1 prepared in the above Example 4 was added again as seed and the mixture was stirred at 50° C. for 22 hrs. The cake was collected by vacuum filter and dried at 50° C. for 16 hrs to obtain the solid (168.2 mg, yield of ˜72%).

The XRPD analysis of the resultant solids of Examples 5A and 5B confirmed that the solids of Example 5A and 5B are Form B as their XRPD patterns (FIG. 4G) are consistent with that of Example 4 (FIG. 4A).

Example 6: Slurry Conversion from Compound 1 of Form A or Amorphous Form at Different Temperatures

Slurry conversion experiments were conducted in different solvent systems at different temperature with Compound 1 in Form A or Compound 1 in amorphous form as the starting material.

Example 6A: Slurry Conversion from Form A at 5° C.

Slurry conversion experiments were conducted in different solvent systems at 5° C. by suspending about 15 mg of Form A prepared in the above Example 2 with 0.3 mL of solvent in a 1.5-mL glass vial. After stirring for about 6 days, the suspensions were isolated by centrifuge, and the solids were analyzed by XRPD. Results summarized in Table 3 showed Form A was obtained from some solvent systems at 5° C., as the XRPD patterns of the resultant crystalline forms are consistent with Form A as an EtOAc solvate in Example 2.

TABLE 3
Summary of slurry conversion experiments at 5° C.

No.	Solvent (v/v)	Solid Form
A01	Isopropyl acetate	Form A
A02	Isopropyl alcohol	N/A
A03	H2O	Form A
A04	MTBE	Form A
A05	n-heptane	Form A
A06	MeOH/H2O (l:5)	amorphous
A07	ACN/H2O (1:5)	N/A
A08	Acetone/H2O (1:5)	amorphous
A09	Acetic acid/H2O (1:5)	N/A
A10	NMP/H2O (1:5)	Form A
A11	THF/n-heptane(l:5)	Form A
A12
	1,4-Dioxane/n-heptane(l:5)	Form A
A13	EtOAc/n-heptane(l:5)	Form A
A14	DCM/MTBE(1:5)	Form A
N/A: no solid was obtained.

Example 6B: Slurry Conversion from Form A at RT

Slurry conversion experiments were conducted in different solvent systems at RT by suspending about 15 mg of Form A with 0.5 mL of solvent in a 1.5-mL glass vial. After stirring for about 6 days, the suspensions were isolated by centrifuge, and the solids were analyzed by XRPD. Results summarized in Table 4 showed Form A was obtained from some solvent systems at RT, as the XRPD patterns of the resultant crystalline forms are consistent with Form A as an EtOAc solvate in Example 2.

TABLE 4
Summary of slurry conversion experiments at RT

No.	Solvent (v/v)	Solid Form
B0l	Isopropyl acetate	Form A
B02	Isopropyl alcohol	N/A
B03	H2O	amorphous
B04	MTBE	Form A
B05	MeOH/H2O(l:5)	amorphous
B06	ACN/H2O (1:5)	N/A
B07	Acetone/H2O (1:5)	N/A
B08	Acetic acid/H2O (1:5)	N/A
B09	NMP/H2O (1:5)	amorphous
B10	THF/n-heptane(l:5)	Form A
B11
	1,4-dioxane/n-heptane(l:5)	Form A
B12	EtOAc/n-heptane(l:5)	Form A
B13	CHCl3/MTBE(1:5)	Form A
N/A: no solid was obtained.

Example 6C: Slurry Conversion from Compound 1 in Amorphous Form

Slurry conversion experiments were conducted in varying solvent systems at RT and 50° C. using Compound 1 in amorphous form as the staring material. A certain amount (10-25 mg) of Compound 1 in amorphous form was added into the corresponding solvent. The resultant mixture was stirred at the desired temperature for 2 hrs. About 2 mg of Form B was added as seed. The mixture was stirred for another 60 hrs at the same desired temperature. The resultant solid was collected for XRPD analysis.

TABLE 5
Summary of slurry conversion experiments starting
from Compound 1 in amorphous form

No.	Solvent (v/v)	Condition	Solid Form
C01	EtOAc/n-hexane (1:1)	RT,	Form A + B
C02	EtOAc/n-hexane (1:3)	Form B seeded	Form B
C03	EtOH/n-heptane (1:3)		Form A
C04	Acetone/n-heptane (1:3)		Form A + B
C05	THF/n-heptane (1:3)		Form A + B
C06	CHCl3/n-heptane (1:3)		Gel
C07	EtOAc/n-hexane (1:1)	50° C.,	Form B
C08	EtOAc/n-hexane (1:3)	Form B seeded	Form B
C09	EtOH/n-heptane (1:3)		Form A
C10	Acetone/n-heptane (1:3)		Form B
C11	THF/n-heptane (1:3)		Form B
C12	CHCl3/n-heptane (1:3)		Form B
C13	EtOH/H2O (1:5)		Gel
C14	THF/H2O (1:5)		Gel
C15	CHCl3/MTBE (1:5)		Form B
C16	Acetone/MTBE (1:5)		Form B

The above table showed that Compound 1 in amorphous form can be converted into Form A, Form B or mixture thereof in slurry conversion conducted in varying solvent systems at room temperature (20±2° C.) and 50° C. followed by addition of Form B seeds. FIG. 5A and FIG. 5B confirmed the crystalline forms of the resultant solids obtained at different temperatures.

Example 6D: Thermodynamic Stability in Current Process Solvent Systems

About 500 mg, 300 mg, 100 mg and 70 mg of Compound 1 in amorphous form of Example 1 were weighted into each 3-mL glass vial. 1.0 mL of EtOAc/n-heptane (solvent ratio: 1/0*, 3/1, 1/1, 1/3) was added into each of the above vial sequentially. The mixtures were stirred at 50° C. for 2 hrs to get saturated solutions. Equally, about 10 mg of Compound 1 in Form A of Example 2 and Form B of Example 4 in an approximate mass ratio of 1:1 were added into each 1.5 mL glass vial. 0.3 mL of each of the above corresponding saturated solution (equilibrated at 50° C.) was added into each of the above 1.5 mL glass vial and stirred at desired temperature. Samples were collected after 3, 6 and 13 days for XRPD characterization until form conversion was observed. (*Clear solution in pure EtOAc was obtained due to not enough Compound 1 in amorphous form)

Results were summarized in Table 6, FIGS. 5C, 5D and 5E.

TABLE 6
Summary of thermodynamic stability
in current process solvent systems

No.	Solvent (v/v)	Condition	Solid Form
D01	EtOAc
	10° C.	Form A
D02	EtOAc/n-heptane (3:1)		Form A
D03	EtOAc/n-heptane (1:1)		Form A
D04	EtOAc/n-heptane (1:3)		Form A + B
D05	EtOAc	RT	Form A
D06	EtOAc/n-heptane (3:1)		Form A
D07	EtOAc/n-heptane (1:1)		Form A
D08	EtOAc/n-heptane (1:3)		Form A* + B
D09	EtOAc
	50° C.	Form B
D10	EtOAc/n-heptane (3:1)		Form B
D11	EtOAc/n-heptane (1:1)		Form B
D12	EtOAc/n-heptane (1:3)		Form B
*Small part of Form A was observed, indicating Form B is thermodynamically more stable under this condition.

In the above competitive slurry turnover experiments, Form A and Form B were exposed under EtOAc/n-heptane system with a series of solvent ratios and temperatures (10° C., 20±2° C., and 50° C.), which indicated that Form B is thermodynamically more stable than Form A at 50° C., and at room temperature with a volume fraction of EtOAc decreased to 0.25. Concluded from Example 6, anhydrous non-solvated Form B tends to be the stable crystalline form under conditions with elevated temperature, decreased EtOAc content, seed loading and extended equilibration time.

Example 7: Hygroscopic Test

Compound 1 in Form B prepared in Example 4 was subjected to hygroscopic test using dynamic vapor sorption (DVS). The DVS plots is shown in FIG. 4E suggesting Form B is non-hygroscopic. After the DVS test, no form change was observed by XRPD comparison as shown in FIG. 4F.

The long term stability studies of Compound 1 in Form B showed there was no significant chemical purity change occurred when stored at 25° C./60% RH for up to 12 months and at 40° C./75% RH condition for up to 6 months. In addition, no crystal form and optical purity changes were observed when stored at 25° C./60% RH for up to 12 months and at 40° C./75% RH condition for up to 6 months.

Example 8: Mechanical Test

Grinding experiments were conducted in two conditions with water and without any solvent. About 15 mg of Compound 1 in Form A prepared in Example 2 was added into the mortar and manually ground with/without solvents for 5 minutes before the solids were collected and analyzed. As summarized in Table 7, amorphous was obtained by XRPD characterization.

TABLE 7
Summary of grinding experiments

No.	Solvent	Solid Form
1	N/A	amorphous
2	H2O	amorphous
N/A: no solvent was added.

Grinding experiments were also conducted with respect to Form B of Example 4 to evaluate possible form change of Form B under mechanical force. Neat and water-assisted grinding experiments were performed with respect to Form B. About 15 mg of Compound 1 in Form B prepared in Example 4 was added into the mortar and manually ground with/without water for 5 minutes. Then solids were collected for XRPD characterization. FIG. 4H showed that mechanical strain did not change Form B to become amorphous or other forms, although crystallinity has been decreased after grinding. The result further confirmed Form B is more stable then Form A.

Example 9

Determination of Absolute Configuration of Compound 1

Preparation of BG-13 Single Crystal

Six single crystal growth experiments (see Table 8) were performed via slow cooling. Suitable single crystals of BG-13 were obtained by slow cooling in MeOH/H₂O (1:1, v/v).

TABLE 8
Single Crystal Growth Experiments

Experiment	Weight	Solvent		Temperature	Dissolved
ID	(mg)	(1 mL, v/v)	Method	(° C.)	(Y/N*)	Observation
1	5.6	IPA/H2O (3/1)	cooling	60	N	Block-like crystal
2	5.5	IPA/H2O (3/1)	cooling	60	N	Block -like crystal
3	5.4	IPA/H2O (3/1)	cooling	60	N	Block -like crystal
4	5.5	IPA/H2O (3/1)	cooling	60	N	Block -like crystal
5	4.7	MeOH/H2O (2/1)	cooling	60	N	Crystal
6	5.5	MeOH/H2O (1/1)	cooling	60	N	Crystal

The single crystal data and structure refinement data were generated as shown in Table 9 on a Bruker APEX DUO single-crystal diffractometer with CCD detector (Cu Kα, λ=1.54178 Å, 173.15 K).

TABLE 9
Single Crystal Data and Structure Refinement of BG-13

Empirical formula	C33H34N5O6	—
Formula weight	596.65
Temperature	173.15	—
Wavelength	1.54178 Å	—
Crystal system, space	monoclinic	C2
group
Unit cell dimensions	a = 16.7939(4) Å	alpha = 99.00 deg..
	b = 7.9871(2) Å	beta = 108.0460(10) deg.
	c = 23.5438(5) Å	gamma = 90.00 deg.
Volume	3002.69(12) Å3	—
Z, Calculated density	4	1.320 mg/mm3
Absorption coefficient	0.756 mm−1	—
F(000)	1260.0	—
Crystal size	0.3 × 0.21 × 0.08 mm3	—
Theta range for data	1.97 to 64.96 deg.	—
collection
Limiting indices	−19 <= h <= 1,	—
	−7 <= k <= 9,	—
	−27 <= l <= 24	—
Reflections	5073/3756	—
collected/unique	[R(int) = 0.1062]
Completeness	92.8%	—
Refinement method	Full matrix least	—
	squares on F2
Data/restraints/parameters	3756/1/398	—
Goodness-of-fit on F2	1.192	—
Final R indices	R1 = 0.0819	wR2 = 8.2294
[I > 2sigma(I)]
Absolute structure Flack	0.0(3)
Largest diff. peak and	0.50 and −0.57 e · A−3	—
hole

BG-13 was confirmed to be a (2R, 3R)-dibenzoyl tartaric acid (L-DBTA) salt and the molar ratio of freebase to L-DBTA is 2:1. Configuration of both carbons (C32 and C32′) in L-DBTA was confirmed to be R. Configuration of C6 in freebase was determined to be S, as shown in FIG. 6A to FIG. 6C. A powder X-ray diffraction pattern method was also used to characterize the structure of the single crystals, as shown in FIG. 6D.

Absolute Configuration of Compound 1

The absolute configurations of Compound 1 was deduced to be S from the single crystal X-ray structural analysis of intermediate BG-13.

EFFICACY TESTS

(1) BTK Kinase Enzymatic Assay

Form B of Compound 1 was tested for inhibition of BTK kinase (aa2-659, Carna Biosciences) in assays based on the time-resolved fluorescence-resonance energy transfer (TR-FRET) methodology. The assays were carried out in 384-well low volume black plates in a reaction mixture containing BTK kinase, 5 μM ATP, 2 μM peptide substrate and 0-10 μM Form B of Compound 1 of Example 4 in buffer containing 50 mM Tris pH7.4, 10 mM MgCl2, 2 mM MnCl₂, 0.1 mM EDTA, 1 mM DTT, 0.005% Tween-20, 20 nM SEB and 0.01% BSA. The kinase was incubated with compound for 60 minutes at room temperature and the reaction was initiated by the addition of ATP and peptide substrate. After reaction at room temperature for 60 minutes, an equal volume of stop/detection solution was added according to the manufacture's instruction (CisBio Bioassays). The stop/detection solution contained Eu³⁺ cryptate-conjugated mouse monoclonal antibody (PT66) anti-phosphotyrosine and XL665-conjugated streptavidin in buffer containing 50 mM HEPES pH 7.0, 800 mM KF, 20 mM EDTA, and 0.1% BSA. Plates were sealed and incubated at room temperature for 1 hour, and the TR-FRET signals (ratio of fluorescence emission at 665 nm over emission at 620 nm with excitation at 337 nm wavelength) were recorded on a PHERAstar FS plate reader (BMG Labtech). Phosphorylation of peptide substrate led to the binding of anti-phosphotyrosine antibody to the biotinylated peptide substrate, which places fluorescent donor (Eu³⁺ crypate) in close proximity to the accepter (Streptavidin-XL665), thus resulting in a high degree of fluorescence resonance energy transfer from the donor fluorophore (at 620 nm) to the acceptor fluorophore (at 665 nm). Inhibition of BTK kinase activity resulted in decrease of the TR-FRET signal. The IC₅₀ for Compound 1 in Form B was derived from fitting the data to the four-parameter logistic equation by Graphpad Prism software.

The IC50 of Compound 1 in Form B is 1 nM.

(2) Biochemical Kinase Selectivity

Selectivity of Form B was profiled against a panel of 367 kinases at 2 μM at Reaction Biology Corp. Form B displayed less than 70% inhibition against 358 kinases, and greater than 70% inhibition against 9 kinases including BTK.

Claims (7)

The invention claimed is:

1. Crystalline Form A of Compound 1:

wherein the crystalline form is an ethyl acetate solvate; and

wherein the crystalline form is characterized by an X-ray powder diffraction pattern comprising diffraction peaks having angle values (° 2θ) at 18.6°±0.2° 2θ, 19.8°±0.2° 2θ, and 20.6°±0.2° 2θ.

2. The crystalline form of claim 1, wherein the crystalline form is further characterized by an X-ray powder diffraction pattern comprising additional diffraction peaks having angle values (° 2θ) at 5.3°±0.2° 2θ and 16.90±0.2° 2θ.

3. The crystalline form of claim 1, wherein the crystalline form is further characterized by an X-ray powder diffraction pattern comprising additional diffraction peaks having angle values (° 2θ) at 5.3°±0.2° 2θ, 10.9°±0.2° 2θ, 16.9°±0.2° 2θ, 21.1°±0.2° 2θ, 22.5°±0.2° 2θ, and 22.8°±0.2° 2θ.

4. The crystalline form of claim 1, wherein the crystalline form is further characterized by an X-ray powder diffraction pattern comprising additional diffraction peaks having angle values (° 2θ) at 5.3°±0.2° 2θ, 10.9°±0.2° 2θ, 11.2°±0.2° 2θ, 13.4°±0.2° 2θ, 14.4°±0.2° 2θ, 16.9°±0.2° 2θ, 21.1°±0.2° 2θ, 21.7°±0.2° 2θ, 22.5°±0.2° 2θ, 22.8°±0.2° 2θ, 23.6°±0.2° 2θ, and 24.3°±0.2° 2θ.

5. The crystalline form of claim 1, wherein the crystalline form is further characterized by a differential scanning calorimetry curve in accordance with FIG. 2B.

6. The crystalline form of claim 1, wherein the crystalline form is further characterized by a thermogravimetric analysis curve in accordance with FIG. 2B.

7. A process for preparing crystalline Form A of Compound 1 of claim 1:

wherein the crystalline form is an ethyl acetate solvate;

wherein the crystalline form is characterized by an X-ray powder diffraction pattern comprising diffraction peaks having angle values (° 2θ) at 18.6°±0.2° 2θ, 19.8°±0.2° 2θ, and 20.6°±0.2° 2θ; and

wherein the process comprises the following steps:

(a) dissolving an amorphous form of Compound 1 in a solvent selected from the group consisting of acetic acid, acetone, acetonitrile, chloroform, dichloromethane, N,N-dimethylacetamide, dimethylsulfoxide, 1,4-dioxane, ethanol, ethyl acetate, isopropanol, isopropyl acetate, methanol, methyl isobutyl ketone, 1-methyl-2-pyrrolidone, tetrahydrofuran, 2-methyltetrahydrofuran, and toluene, or a mixture thereof;

(b) adding an anti-solvent selected from the group consisting of cyclohexane, n-heptane, n-hexane, methyl tert-butyl ether, petroleum ether, and water, or a mixture thereof, to the solution provided in step (a), to induce precipitation; and

(c) maintaining the mixture provided in step (b) at a temperature below 25° C. or at a temperature of 25° C., to precipitate the crystalline Form A of Compound 1 of claim 1.

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